误差范围

On the basis of color imaging system, an automated photoelasticity in white light for determining isochromatics and isoclinics is presented It includes two techniques One is automation of the ordering of color isochromatics based on BP neural network The other is whole field digital determining of isoclinic angles by five step color phase shifting Many limitations and drawbacks, which affect the precision of measurement, were more eliminated and improved The validity of experimental results was ...

以彩色信息图象处理技术为基础，围绕光弹性实验数据自动采集这个主题，提出用BP神经网络自动确定等色线分数级条纹及其级数的颜色插值法，以及全场数字化确定等倾角的五步彩色相移法。典型实验表明，上述方法在提高光弹性数据采集自动化程度和减少各种误差因素影响等方面均有所改善；进而提高三维光弹性薄切片应力分析结果的精度，促进实验应力分析的工程应用，扩大光弹性法的应用范围。

Some safely landing region in vision field can be recognized by image processing and the region character can also be recognized.

当前，由于着陆时定点的误差较大，在小范围安全地域准确着陆很难。

The main research and application result is: five dynamic sampling frames with spatial autocorrelation analysis are achieved such as high-high, low-low, high-low, low-high and not significant, and finally the result of per capita agricultural total output value of Beijing with spatial stratified sampling technique is 35.80 thousand Yuan RMB, with the sampling error range is ±3.861 thousand Yuan RMB.

其结果为：动态生成"高－高集聚"、"低－低集聚"、"高－低集聚"、"低－高集聚"和"分布不明显"5个抽样框，并最终通过空间分层抽样流程得到北京市人均农业总产值的抽样调查结果为3.580万元，抽样误差的允许范围为±0.3861万元。

E. , the sum of absolute intensities of normalized block along the main and sub-principal diagonal pixels）, which is a modification of original one, is utilized to confine efficiently the search space to the vicinity of the initial-matched block

具体说，它把子块叉迹的定义修改为其规范子块主次对角元绝对值之和，并利用新叉迹把搜索范围限制在初始匹配块的邻域内；同时，引入误差阈值来控制以初始匹配块为中心的搜索邻域大小。

The obtained maximum relative standard deviation was 5.89%, and relative errors were -20.99%-15%.

实验结果表明，测量结果的相对标准偏差最大为5.89%，相对误差在-20.99%～15%范围内，说明对铝合金样品成分进行定量分析，激光诱导击穿光谱是一种有效的光谱分析工具，但是分析结果的准确度仍需要提高。

The non-reference-signal's adaptive digital filter algorithm of multi-sensor data fusion in the course of adaptive filter can be done without reference signals. It can adjust convergence constant automatically, it can also be recurred with real gradient value. Thus the field to apply the adaptive filter is widened, the convergence speed of the adaptive filter is sped up, the weighted disadjustmend is decreased, so that the last error of mean square approaches its minimum value more.

这章研究的基于多传感器数据融合无参考信号的自适应数字滤波算法其在自适应滤波过程中具有不用参考信号与自动调整收敛因子及使用实际梯度值进行递推的特点，这样不仅可扩大自适应滤波的使用范围，而且还使自适应滤波的收敛速度加快有效地减小权失调，从而使最后的均方误差更接近于其最小值。

To meet the common demands of the heterodyne signal process system, a phase measurement system based on dual-differential phase discrimination is studied and applied. With the frequency range of 5kHz-50kHz, this system has sampling rate of 10/sec, stability of ±0.0036°, maximum error of ±0.06°, and it can measure the zero point of phase angle.

围绕高精度外差信号处理系统的一般要求，研究和实现了基于双向差动鉴相的相位测量系统，在5kHz-50kHz的范围内、采样速率10次／秒时，示值稳定性优于±0.0036°，最大误差小于±0.06°，可以测量零相位。

Crystal lattice constants are close to other experiment results. Three kinds of chemical bonds exist among Mg and B atoms, between magnesium and boride is ionic bond and metallic bond is the predominant interaction in the layer formed by magnesium atoms. A strong covalent bond in the form of sp2 hybrid between boride atoms is the most important factors which can affect the transition temperature of MgB2. Population analysis clearly shows that electrons are transferred from Mg to B, as a result, the electron-phonon coupling in the layer of B is very strong.

规范保守赝势的计算结果表明，晶格常数与实验值误差在很小的范围内，分析了引起MgB2(001)面结构超导转变时电子浓度和偏态密度的变化情况，发现构成该超导体结构的成键有3种，着重从结构的电子浓度变化分析了其超导特性，六角蜂窝状结构中硼原子间相互作用为sp2杂化的共价键，镁原子和硼原子之间是离子键结合，镁原子层是金属键结合，镁原子的价电子部分转移到硼原子的pz轨道，部分电子为镁原子层共用。

Simulation results for the images with different structure and contrast show that TTLS method can yield high quality image and its application field is larger than that of Tikhonov regularization method.

对不同结构以及不同对比度图像的数值仿真结果显示，截断完全最小二乘正则化方法，较只考虑数据项存在误差的Tikhonov正则化方法成像质量高，且适用范围广。

This algorithm is robust and adaptive to characters of sensor network.The contribution of this paper is that the authors design and implement the software of time synchronization on real sensor nodes,and control the error within microsecond,which has great profit for the real environment of sensor network.

该文的贡献在于在实际的传感器节点上设计并实现了时间同步算法的软件并分析了实验结果，以此将时间同步的误差保持在微秒级的范围内，对传感器网络应用到实际环境中有一定的意义。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。